The reaction of the title compounds leads to a zwitterionic cycloadduct as is demonstrated by 1H, 13C, and 15N n.m.r. spectroscopy
A. Kerbal, J. Vebrel, E. Cerutti and B. Laude, J. Chem. Soc., Chem. Commun., 1989, 632 DOI: 10.1039/C39890000632
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